compile with gcc -o tempest tempest.c -lGL

move the binary to /usr/lib/xscreensaver
for KDE, put tempest.desktop in /usr/share/applnk/System/ScreenSavers
for X screensaver add
- GL: tempest -root \n\
to .xscreensaver in your home directory

for configuration, run tempest with -help
add options to .xscreensaver or tempest.desktop as desired
